.twodiv{
    border: solid silver 2px;
    background: black;
    width: 900px;
    height:250px;
    margin: 0px auto;
}
.sandiv{
    color: white;
    text-align: center;
    font-size: 14px;
    padding: 10px;

  }
.sidiv{
    font-size: 10px;
    color: white;
    text-align: center;
    padding: 0px;
}
.wudiv{
    font-size: 16px;
    color: white;
    background-color: #31BFC3;
    width: 80px;
    height: 30px;
    text-align: center;
    margin: 0px auto;
}
#one:hover{
    color: red;
}
#one{
    color: white;
    text-decoration: inherit;
}
#two{
    /*border: solid red 2px;*/
    width: 800px;
    height: 200px;
    margin: 0px auto;
    padding: 2px;
}
.yuanxing{
    /*border: solid sienna 2px;*/
    margin-top: 50px;
    border-radius:50%;
    width: 50px;
    height: 50px;
    background-color: #D8D8D8;
}
#san{
    margin-top: -70px;
    padding-left: -50px;
}
#si{
    margin-top: -70px;
    padding-left: -50px;
}
